package edu.ngl;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet Filter implementation class MyFilter
 */
@WebFilter(urlPatterns = {"/*"})
public class MyFilter implements Filter {

    /**
     * Default constructor. 
     */
    public MyFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here

		// pass the request along the filter chain
		
		HttpServletRequest req = (HttpServletRequest)request;
		String path = ((HttpServletRequest) request).getRequestURI();
		//请求不是�?.jsp结尾，并且不是以Login结尾，并且username信息为空,则重定向到登录页�?
		//登录请求不用�?查，jsp文件不用�?�?
		if((!path.endsWith(".html"))&(!path.endsWith("Login"))
				&&req.getSession().getAttribute("username")==null) {
			HttpServletResponse res = (HttpServletResponse)response;
			res.sendRedirect("index.html");
		}else {
			chain.doFilter(request, response);
		}
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
